$(function(){
			var current=0;
			var count=$(".polist li").length - 1;
			var width=$(".polist li").width();
			
			function next(){
				if(current>=count){
					current=0;
				}else{
					current++;
				}
				$(".polist li").eq(current).addClass("active").siblings().removeClass("active")
				$(".polist").css("left",-1 * width * current + "px")
			}
			
			setInterval(function(){
				next();
			},2000)
		})